2015年10月17日

Modern Operating System --- Power Management (CPU)

摘要: The CPU can also be managed to save energy. A notebook CPU can be put to sleep in software, reducingpower usage to almost zero. The only thing it can ... 阅读全文

posted @ 2015-10-17 05:34 Persistence 阅读(208) 评论(0) 推荐(0)

Modern Operating System --- Power Management (Hard Disk)

摘要: Another major villain is the hard disk. It takes substantial energy to keep it spinning at highspeed, even if there are no accesses. Many conputers, e... 阅读全文

posted @ 2015-10-17 05:04 Persistence 阅读(163) 评论(0) 推荐(0)

Modern Operating System --- Power Management (OS Issues)

摘要: The operating system plays a key role in energy management. It controls all the devices, so itmust decide what to shutdown and when to shut it down. I... 阅读全文

posted @ 2015-10-17 02:33 Persistence 阅读(222) 评论(0) 推荐(0)

Modern Operating System --- Power Management (Hardware Issues)

摘要: The general approach most computer vendors take to battery conservation is to design the CPU,memory, and I/O devices to have multiple states: on, slee... 阅读全文

posted @ 2015-10-17 02:22 Persistence 阅读(181) 评论(0) 推荐(0)

Modern Operating System --- Power Management

摘要: The first general-purpose electronic comuter, the ENIAC, had 18,000 vacuum tubes andconsumed 140,000 watts of power. As a result, it ran up a non-triv... 阅读全文

posted @ 2015-10-17 00:49 Persistence 阅读(130) 评论(0) 推荐(0)

Modern Operating System --- Thin Clients

摘要: Over the years, the main computing paradigm has oscillated between centralized and decentralizedcomputing. The first computers, such as the ENIAC, wer... 阅读全文

posted @ 2015-10-17 00:42 Persistence 阅读(95) 评论(0) 推荐(0)

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